Time Travel. (2013). The History Channel website. Retrieved 5:50, June 19, 2013, from http://www.history.com/shows/the-universe/episodes/season-5.
Time Travel. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/the-universe/episodes/season-5 [Accessed 19 Jun 2013].
“Time Travel.” 2013. The History Channel website. Jun 19 2013, 5:50 http://www.history.com/shows/the-universe/episodes/season-5.
“Time Travel,” The History Channel website, 2013, http://www.history.com/shows/the-universe/episodes/season-5 [accessed Jun 19, 2013].
“Time Travel,” The History Channel website, http://www.history.com/shows/the-universe/episodes/season-5 (accessed Jun 19, 2013).
Time Travel [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/shows/the-universe/episodes/season-5.
Time Travel, http://www.history.com/shows/the-universe/episodes/season-5 (last visited Jun 19, 2013).
Time Travel. The History Channel website. 2013. Available at: http://www.history.com/shows/the-universe/episodes/season-5. Accessed Jun 19, 2013.